[PVE-User] Expected fencing behavior on a bifurcated 4-node HA cluster

Alexandre DERUMIER aderumier at odiso.com
Wed May 3 09:46:26 CEST 2017


Maybe this is because node only reboot if an HA vm is present on the node ?


if you had HA vm on all 4 nodes, I think that all nodes should be reboot by watchdog. (as you lost quorum on 4 nodes)

----- Mail original -----
De: "Adam Carheden" <carheden at ucar.edu>
À: "proxmoxve" <pve-user at pve.proxmox.com>
Envoyé: Mardi 2 Mai 2017 17:40:37
Objet: [PVE-User] Expected fencing behavior on a bifurcated 4-node HA	cluster

What's supposed to happen if two nodes in a 4-node HA cluster go offline? 


I have a 4-node test cluster, two nodes are in one server room and the 
other two in another server room. I had HA inadvertently tested for me 
this morning due to an unexpected network issue and watchdog rebooted 
two of the nodes. 

I think this is the expected behavior, and certainly seems like what I 
want to happen. However, quorum is 3, not 2, so why didn't all 4 nodes 
reboot? 

# pvecm status 
Quorum information 
------------------ 
Date: Tue May 2 09:35:23 2017 
Quorum provider: corosync_votequorum 
Nodes: 4 
Node ID: 0x00000001 
Ring ID: 4/524 
Quorate: Yes 

Votequorum information 
---------------------- 
Expected votes: 4 
Highest expected: 4 
Total votes: 4 
Quorum: 3 
Flags: Quorate 

Membership information 
---------------------- 
Nodeid Votes Name 
0x00000004 1 192.168.0.11 
0x00000003 1 192.168.0.203 
0x00000001 1 192.168.0.204 (local) 
0x00000002 1 192.168.0.206 

# ha-manager status 
quorum OK 
master node3 (active, Tue May 2 09:35:24 2017) 
lrm node1 (idle, Tue May 2 09:35:27 2017) 
lrm node2 (active, Tue May 2 09:35:26 2017) 
lrm node3 (idle, Tue May 2 09:35:23 2017) 
lrm node3 (idle, Tue May 2 09:35:23 2017) 

Somehow proxmox was smart enough to keep two of the nodes online, but 
with a quorum of 3 neither group should have had quorum. How does it 
decide which group to keep online? 

Thanks 
-- 
Adam Carheden 
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